上教版三年级数学《组合图形的面积》

长×宽边长×边长组合图形的面积3m5m2m3m8m5m3m5m2m3m8m5m①②①②5m2m3m5m①②3m8m10cm5cm8cm18cm7cm12cm①②③10m8m10m22m18m①②12m①—②2m8m6m8m10m2m①②①+②2m8m6m8m2m①②①+②10m2m8m6m8m10m2m①②①—②20cm12cm①②①—②60m40m5m①②①—②25cm35cm15cm10cm①②③??25cm35cm15cm10cm①②③??35cm15cm10cm①②①—②35×25—15×1025cm①②①—②7×5—3×3=35—9=26（dm2)